fix attempt to prevent possibility of div-by-zero
(CC) Create Macro.h and add ONEHZLIMITER
	modified:   ../../Header/externs.h
	modified:   ../../Header/options.h
	modified:   CalculateScreen.cpp
	modified:   CalculateWaypointReachable.cpp
	modified:   LKProcess.cpp
	modified:   RenderMapWindow.cpp
	../../Header/Macro.h
CalculateWayPointReachable using ONEHZLIMITER, and multicalc engine moved from RenderMapWindowBg to the called function, internally.
	modified:   ../../Header/MapWindow.h
	modified:   CalculateWaypointReachable.cpp
	modified:   RenderMapWindowBg.cpp
	../../Header/Macro.h
Do not use ONEHZLIMITER in Screen calculations because they happen at 2hz sometimes
	new file:   ../../Header/Macro.h
	modified:   CalculateScreen.cpp
Merge branch 'div_by_zero' of http://github.com/ericcarden/LK8000
New DrawAirSpaceBorders, draws airspaces directly on hdc, and does not use bitblt.
Cpu needed reduced by 92%
	modified:   ../../Header/MapWindow.h
	new file:   DrawAirSpacesBorders.cpp
	modified:   RenderMapWindowBg.cpp
	modified:   ../../../Makefile